Rubbing compound



Patented Sept. 26, 1933 UNITED STATES 1,927,872 RUBBING COMPOUND Paul H.Kramer, Detroit,.Mich., assignor to Park Chemical Company, Detroit, Micha corporation of Michigan No Drawing. Application May 23, 1930 SerialNo. 455,144

4 Claims.

My invention relates to an abrasive composition adapted for use incutting down and polishing lacquered, painted, varnished or enameledsurfaces. It embraces a new material for use 5 in the art and the methodof manufacturing the same.

The abrasive or rubbing compounds which have been used heretoforeconsist of abrasives suspended in oil-water emulsions in which astearate soap has formed a jelly to promote the stability of the whole;or similar suspensions in which wax has been incorporated with the oil;or similar suspensions of abrasives in oil-wax mixtures in which the waxacts as the stabilizing agent. Any of these three types is adapted touse on a rubbing ball of cheese cloth, beef tubing, underwear remnants,or any other suitable textile material. The method of cutting down andpolishing lacquered, painted, varnished or enameled surfaces byapplication of a plastic abrasive or rubbing compound to the surface bymeans of a rubbing ball is common practice wherever such surfaces arepolished.

However, the abrasive or rubbing compounds in 25 common use have seriousdefects and it is one of the objects of my invention to eliminate thesedefects.

One of the objects of my invention is to produce an abrasive or rubbingcompound which is soft and plastic and stable at temperatures betweenthe freezing point of water and approximately 160 F.

The rubbing compounds which are stabilized by means of a soap jelly arethickened by cooling in their manufacture, and when subjected toabnormally warm temperatures, say above 95 F., they start to soften andprecipitate the abrasive out of suspension. In this manner a hard cakeof abrasive is formed in the bottom of the container and the material isno longer suitable for use.

The same objection applies to the oil-wax abrasive mixtures. In theircase, the softening point is approximately the melting point of the oil-45 wax mixture, which must be a little higher than 90-95 F. to permittheir use at ordinary temperatures. At temperatures in excess of thisfigure they also precipitate the'abrasive which renders them unfit foruse. The oil-wax abrasive mixtures have the further disadvantage ofattaining a hard, crumbly condition in cold weather.

Another object of my invention is to produce a material which polishesthe lacquered, painted, varnished or enameled surfaces and leaves itclean with no trace of a scum or haze.

This is not true of the compounds which contain a stearate or a wax. Inthe one case there is always a slight amount of stearic acid or stearatedeposited; and in the case of the wax mix- I tures there is a slightdeposit of wax on the surface. These defects are overcome by my presentinvention.

I have found that slight additions of pine oil, a product derived fromthe steam distillation of pine wood at temperatures below 225 degrees C.to an alkali oleate emulsion of mineral oil and water thicken theemulsion tremendously, changing it from a fairly viscous liquid to apaste easily capable of holding an abrasive, such as tripoli,

in permanent suspension at temperatures between 0 I the freezing pointof water and 160 F. or higher. The stability of this emulsion does notdepend on the formation of a jelly, or upon any cooling action whateverand, therefore, doesnot vary with changes in temperature. Moreover, thefact that an alkali oleate is easily soluble in water assures itsremoval in the clean-up operation; and the excess oleic acid, beingliquid, also cleans up easily.

The above mentioned phenomenon, that is the thickening of anoil-water-oleate emulsion by additions of pine oil, is probably due tothe partial precipitation of the soap. This phenomenon is well known inthe case of such addition agents as excess alkali, sodium carbonate,sodium chloride, magnesium chloride, etc., and I believe that a similaroccurrence takes place with pine oil. In this case, however, largeadditions of pine 011 do not seem to cause total precipitation of soapfrom solution, as is the case with the inorganic salts.

The following is an example of a specific compound embodying myinvention and method of producing the same:

20 lbs. of oleic acid (red oil), 122 lbs. kerosene and 7 lbs. pine oilare placed in the mixer.

2 lbs. 0. p. caustic soda are dissolved in 5 gallons of water. Theagitator in the mixer is started and the 5 gallons caustic solution isadded gradually to the mixer. Then 10 gallons of water is added to themixer and the mixture stirred until saponification is complete and astiff paste is formed. Finally, 235 lbs. of double ground cream tripoliis added and the mass stirred until smooth and homogeneous throughout.The resulting compound is too stifi to pour but is soft and plastic.

This is my preferred method of manufacture, but I do not wish to limitmyself to the exact no dients may be added in a different order fromthat described, although I have found the described method to be verysatisfactory.

When manufactured as described, the resulting abrasive or rubbingcompound is a smooth, homogeneous mass, soft and plastic, but of aconsistency too thick to pour; it is stable at all temperatures between32 F. and 160 F. and, when applied to a lacquered, varnished, painted orenameled surface, cuts down the irregularities, producing a smooth,lustrous surface, free from any sort of scum or haze.

What I claim as my invention is:

1. A rubbing compound for painted, varnished, lacquered or enameledsurfaces comprising an aqueous suspension of soap, a finely dividedabrasive and pine oil.

2. A rubbing composition for painted, varnished, lacquered or enameledsurfaces comprising as primary ingredients an aqueous suspension of soapfinely divided abrasive material and a stabilizing oil selected from aclass consisting of pine oil and eucalyptus oil of products derivedfrom. steam distillation of vegetable matter at temperatures below 225degrees C.

3. A compound of the class described consisting of an alkali oleateemulsion'of water and mineral oil, an abrasive in suspension, and a pineoil for thickening said emulsion.

4. An abrasive or rubbing compound adapted for cutting down andpolishing lacquered, painted, varnished or enameled surfaces, whichconsists of, substantially 3 per cent sodium oleate, 95 1 per cent oleicacid, 1 per cent pine oil, 24 per cent kerosene, 47 per cent tripoli andthe remainder water.

PAUL H. KRAMER.

CERTIFICATE OF CORRECTION.

man No. 1,927,872.

September 26, 1933.

PAUL H. KRAMER.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 2,lines 84 and 85, claim 2, strike out the words "consisting of pine oiland eucalyptus oil"; and that the said Letters Patent should be readwith this correction therein that the same may conform to the record ofthe case in the Patent Office.

Signed and sealed this 28th day of November, A. D. 1933.

(Seal) E. M. liopkina' Acting Commissioner 'of Patents.

